Mixing machine



March 26, 1929. J. T. SIMPSON MIXING MACHINE Filed Aug. so. 1926 4 Sheets-Sheet 1 .foscyfiaf 52771 295072 1H %2 SH March 26, 1929. J. T. slMPsoN MIXING MACHINE Filed Aug. 50, 1926 v4 Sheets-Sheet 3 AJZ March 26, 1929. 1', SIMPSON 1,706,417

MIXING MACHINE Filed Aug. 30. 1926 4 Sheets-Sheet 5 March 26 192 9.

J. T. SIMPSON 7 1,706,417

MIXING MACHINE Filed Aug. 3Q, 1926 4 Sheets-Sheet 4 i Patented Mar. 26, 1929.

UNITED STATES Josnrn r n, or 'cnr'caao, rumors.

'. I Application filed August 30, 1926. Serial No. 182,381.

My invention relates to continuous mixers, and has for its ob ect improvements ln'devicesfof that class. More particularly-the object is to mix and work over materlal as it passes thru the machine, and to vary theextent of such mixing and working during the time the material is in the machine.

While the present invention has a variety of applications, it is herein'illustrated-and' described as-applied to reparing sand for use in foundries. Foun ry sand ready -for use is'a mixture of various ingredients, but usually contains new sand, previously used I sand, a bonding material and a tempering liquid as water.- These materials must be thoroly mixed and also worked over by pressureyand rubbing so that the grains of san are individually coated with the bonding material and the whole becomes a tough and 'a hub 34 and held in lace by asetscrew'35.

semi-plasticmass. For the making of different' kinds of castings, different grades of i .sandate used, and thse difierent grades are produced partl by difi'erent mixtures and partly by the oroness' with which the materials are -mixed and. worked over. The

. object of the resent invention isto produce I a machinew ich will not only accomplish thedes'ired results-in a thoro and eflicient manner but. one which "isad'ustable so that '30 it is equ'ally eflicient in ro ucing'any'one of. the varied grades of oundry the materials. supplied to it. In the accompanying. drawings: I

" -Fig'. '1 is aplan with the cover removed; Fig. 2 is a side elevation;

nd r m \v n o o u Flg. 3 isan end elevation in direction of 3 of-F1g.2; .Fig. 4 is a section on line 4--4 of Fig. 1; Fig. 5 is a section on line 5-5 of Fig. 1; Fig. 6 is a section on line6-Q6 of Fig. 15

Fig. 7 is a' diagram showing successive positions of one of the kneading rollers;

Fig. 8 is a section on line 8-8 of Fig. 1;. Fig. 9is1a plan, partly in section, o parts of the central .'shaft and associated-parts at an enlarged scale I Fig. 10 isan enl 1OofFig.9;a nd I I Figs. 11 and 12 are-enlarged sections on I lines. 11-11'and' 12- -12, respectively, of Fig.9. Supported" on standards15 and 16 is a trou h or channel '17,. the upper half of whic is rectangular in cross section and the -lowershalfi o f which is semi-circular. w The the hub 34 serves to adjust the rod 40 'lon'gitudinally in the shaft 27 A transverse pm 43 extending into the slot 36 serves to cause 1 a arged section on line 10 upper part of this trough is closed by a cover 18 which is secured by bolts 19 to angle irons 20' riveted to the upper edges of the trough. The trough orchannel 17 is supported directly in extensions 21 and 22. on the standards 15 and 16, and the 'tro'u hand standards are connected together by t e rods 23. I Secured to the extension 21 of standard. 15 is a, hopper 24'thru which material is fed to the interior of the trough.

-Mounted on standards 15 and 16'are-bearings 25 and 26 inwhich is supported a hollow shaft 27, preferably made of a steel cast 1 ing. The journals of this shaft are on parts 1 of the. reduced positions shown at 28 and 29 in Fig. 9. A collar 30in tlfejorm of a cas d with a hub31 is secured to the shaft beyon I the bearing 25 by a set screw: 32. At. tlie ther end of the shaft is acollar 33 having 76 The hub. 34 is screw t readed on theoutside, and has a transverse slot 36. -Mounted on the hub 34 is a hollow nut 37, rovided' with radial holes 38 for. the app icationvofa wrench to adjust it on the hub 34. A set screw 39" serves to 'htild the nut 37 atany desired adjustment. I

Extending thru the shaft '27, andsupfi'orted in the hubs" 31 and 34, is a rod aving collars 41 and 42 pinned thereto. One of thesecollars is inside of the. nut 37. and the other outside, and they are so am ranged that an adjustment of the nut 37 on the rod to turn with the shaft. .AL gear44' secured to the shaft 27 between bear1ng 25 and collar 3Oserves as a means for dr1v1n the shaft 27. A pinion-45 on the same sha t with pulleys 46 serves to drive the gear 44.

On the shaft 27 are bosses-47 arranged in pairs so that one pair' ofbosses are d1rectly- I opposite each other andthe next pair are at right angles to the first pair. The palr's'of bosses thus alternate thruout the entire length of the shaft between the bearings 25 and 26. Each boss is provided withan o n- .ing 48 connecting theiinterior of the aft 27 withvthe exterior.

. Secured to each boss 47 by bolts 49 is'a plate 50 having a hub 51 thereon. Extending thru each hub -51 as a bearing is, a-spmdle' 52 having a conveyor flight 53 secured to its outer end and a crank arm 54 secured to 40 3 as will be hereinafter described. And on the its inner end: Each crank arm has a crank pi1r55. Secured t6, the rod 40 adjacent to each. pair of crank pins 55 isa block 56 having cam slots 57 in its opposite faces for receiving the pins 55. It will be evident that by adjusting the rod 40 longitudinally in the shaft 27, the flights 53 will be adjusted tween the collar 58 and the casting 61 is a Of casting 61 from material entering the disk 69 (Fig. 1), which is secured to the casting 61 at points 70. The purpose of this disk is to protect the hearings in the arms machine thru hopper 24 Another purpose is to cause the material which enters 25 the hopper 24 to flowto the main body of the trough 17in a stream of predetermined 7 depth.

next to the shoulder 78, is a casting 79 and are in line with, the arms 67 and 68 o .with,--the arms 63 to 66 of casting 61.

Secured to the inner face of the extension 22 of standard 16 is a stationary gear 71,

andnextito this is a casting 72 fixed onthe part 29 of shaft 27 by means of set screws 73. The casting'72has arms 74, 75, 76 ,,and 77, which correspond to, and are in line Secured on the part 29 of shaft 27, and

having arms 80 and 81 which correspond to spider casting 61. Also on 'the casting 79 are lugs 82 for. receiving-eye bolts and nuts arms 80 and 81 are lugs '83 for receiving adjusting stop screws 84.

- At the center of the len th of'the shaft'27 are two extra bosses 85 which correspond to the bosses 47, Iand to these bosses85 are.

bolted brackets 86. The brackets86 have arms 87 to 92 which correspond to, and are in line with, the arms 63 to 68"on spider Supported in the arms 63, 74 and 87 is a shaft 93 which carries a small gear; 94 which engages and has a planetary movementaround gear 71. Secured on the shaft 93 are short eccentric rollers 95. Supported in the arms '64, 75- and 88-is a shaft 96 which carries a similar gear 97 for engaging the sta 'tionary gear 71. Secured on the shaft 96 are other short eccentric rollers 98. The rollers 9.5 and 9am called mulling or. kneading V r'ollers,;and are placed irregularly on their shaftsras' shown in Fig, 1.

Supportedin the arms 65 and '66, 76 and 77, and 89 and .90, are shafts 99 and 100 which have gears 101 and 102' engaging the macaw "fixed gear 71 in the same manner. Secured in any suitable manner tothe shafts 99 and 100 are mixing plates 103 and 104.;

Supported in the arms 67 and 68, 80 and 8-1, and 91 and 92, are shafts 105 and 106. 70- Secured on these shafts adjacent to the supporting arms. 80 and 81, are levers 107 and are connected bysprings 109' to eye bolts 110 which extend/thru lugs 82. Nuts 111 75 serve to adjust theiitension of springs 109. Adjustable stop screws 84 serve to limit the inward movement of levers-107 and 108 .under tension of the springs109.

1 Secured at intervals along the shafts 105 B0 and 106 are short arms 112, and secured "to these arms are curved plates 113. .The springs 109 act to movethese plates toward the inner curved surface, of the shell 17 and the adjustable st0ps"8 ifserve to limit the 955.

nearness of approach. v Sand pre ared for use in the foundry usually conslsts of a mixture containingpredetermined proportions of new sand, sand -previously used in the making molds, a 99 bondingmaterial such as clay, and some tempering l1qu1d as water. These materials are fed in unmixed condition into the chain-- ber at the left ofplate 69. The operation of theflights 60 causethesematerials to flow under the edge of the plate 69into the'trough 17, which is the receptacle in which the'unmixed materials are mixed and prepared for use in molding. j

In addition to the mere operation of mixwe ingthe. materials,the grains of sand: must be coated individually with the bonding material so that they will adhere to each other when used in the foundry. To accomplish this result e fliciently it is necessary that 1105 the materials be mixed, be pressed together preferably with a rubbing action, be partly loosened up byturning-them over for mixing, be again pressed together, again turned over and mixed, and-soon alternately until. 110 the sand is in proper condition for use. in V the foundry.

As the -mater1 machine. Here they are enga ed by the flights 53 and conveyed 1 tower the right and are finally discharged thru the bottom opening 114 (Fig. 2).. A plate 115 secured I to lugs 116 onjpart 79 (Fig. 8) seryes to. I26 make a chamber at the right hand end of the machine and prevent the material conveyed to the opening from getting into those I ears.

. The flights 53 do a ertain amount of mixf 1.25 ing, buttheir main purpose is that ofconj veying the material from the/intake at 24 to the discharge opening at 1142 By adjusting the nut 37, these flights are turned on i their pivotal bearings in hubs 51 so as "to Theouter ends of levers 107 and 108 I r als' enter the machine they are engaged by the flights 60 and'forced un-' der the plate 69 into the main body of the. 115

' rows B'. In Fig. 7, the same roller is shown in successive positions. By examining this View it w1ll be seen that the surface of a roller which is adjacent to'the shell 17 moves shafts in a direction o positeto B.

forward more rapidly than does the center of the roller'itself. If these rollers were loose on their shafts, then, as the shafts moved in the direction A, the rollerswould roll on the material in the shell 17 and this would cause "the rollers to turn on their But being fast on their sha t, and the shafts being" driven byplanetary gears engaging the exterior of gear '71, the rollers are drlven in a direction opposite to that in which they would move if they simply rolled on the] material in the shell 17. Owing to this drive, and the fact that the rollers are eccentrically laced on their shafts, these rollers have 0th a rubbing and a kneading or mulling action on the material passing thru the machine. I

The mixing plates 103 and 104 are driven. in'the same way by planetary gears traveling around gear-71.? As a consequence,the, edges of these plates which are nearest to the shell 17 move forward more rapidly than do the shafts which carry them. This action results in these mixing lates lifting the materialfrom the lower part ,of the shell and turningit over. This is a real mixing operation. I The shafts 105 and 106 are normally held in a fixed position by springs 109 and stops overcome the tension of the s rings.

and in front of the rollers.

84, but may be moved by a force which will \Vhen the material is turned over the mixing plates 103 and 104, it is sometimes piled up in heaps. 1 If therollers 95 or 98 should come to such heaps they would push thru them instead of mulling them. Byv inspection of Fig. 4 it will beseen'that the plates 113 come behind the mixing plates 103 and 104 As so arranged,

' the plates 113 serve to level the material in w the shell and thus prepare ,it for the rollers.

- From the foregoing description it will be seen that the material in the machine is moved steadily forward from the intake to the discharge -by the conveyor flights. While these flights are for conveying pi1r poses, they do a certain amount of mixing,

as it would be impossible to pass the material thru the machine by the action ofthese flights without causing mixing.

material as it moves longitudinally thru the" machine, and that the mixing plates operate on the same material at ri ht an les to the action of the conveyor flig ts. salt is to make the two co-operate in the mixing operation. i The action ofithe rollers is to both press and rub the material, and these actions of themselves tend to further mix the material. But these rollers are made in short sections and secured in unmatched relationshi to each other. The result is that these ro lers aid in the mixing operation because the pressure of a short roller into a body of material will cause the material to flow laterally from under the] roller, and such lateral flow results in a mixing operation. v

\VhatI claim is V 1. In a mixer, a receptacle having intake.

.operate on material as it passes thru and means for adjustihg the conveying evice he re-, 1

so as to 'vary thelength of time during.

which the material is operated uponby the mixing and mulling devices.

--21 In a mixer, a. receptacle havin'gsintake and discharge openings, a main shaft provided with connections for driving it, conveyor flights carried'by said shaft and operating to move material thru the machine, devices for turning the material as it is being moved, and rollers also carried by said shaft and serving to mull the material'as it is being moved by said flights. z

3. In a mixer, a receptacle having an opening for the reception of unmixedmaterials, a conveyor arranged to move the received materials thru the receptacle to a discharge opening, devices connected to and operated by the conveyor for mixing and other devices for working the materials as they arebeing moved thru the receptacle by the conveyor, and means for adjusting said conveyor independently of the other devices so as to vary the extentto which the materials are operated upon by the mixing and working devices during their passage thru flights carried by said shaft ahd serving to move, materials from the intake to the discharge .opening, devices for adjusting the cated in said channel and provided with connections for driving it, pivoted conveyor flights carried b said shaft and serving to move material t 1111 the channel, devicesjlocated within the shaft for turning said flights on their pivots so as to vary the rate at which material is conveyed, and connections extending to the exterior of the shaft for operating said devices.

. 6. A conveyor channel, a hollow shaft in said channel, pivoted conveyor flights carried by said shaft,-means operating thru the interior of the shaft to adj list said flights-on their pivots so as to vary the rate material is 'moved thru thechannel, devices carried by said shaft and operating upon the-material being-moved in the channel,.and means located at one end of said channel for controlling the operationof said devices.

7. A conveyor channel, an adjustable con veyor located in said channel, mulling devices carriedby said conveyor and serving to; operate upon material as it is being conveyedby the conveyor, and means located at one end of the channel for controlling the operations of'said devices. n -8. A conveyor channel, a'hollow shaft in said channel conveyor flights provided with pivots extending to the interior of the shaft,

-- a rod supported in the interior of the shaft and providedwith-connections to-the pivots for the flights, and means for adjustingthe rod with respect to the shaft so as to vary the angle of-the flights to the channel within which. they operate.

.9. A conveyor channel rovided with an intake at one end and'a ischarge opening 'at'the other, means located adjacent to the intake for limiting incoming material to a. layer. of predetermined thickness,-a variable conveyor for moving the incoming material along the channel to the discharge opening,

and devices for mixing and mulling ma .terial as it is being conveyed.

10. The combination with conveying devices, devices for mixing material while being conveyed by. the conveying devices, and

other devices for mulling'the material at .thesame time, of interconnections by which one drives the others, and means forvaryingthespeed of one .of them with respect 'to the other two.

11; The combination with conveying devices, devices for mixing material .while bemg conveyed, and devices for mulling the material at the same time, of gears connect- 7 ing the thr'ee devices tpgether, and means for varying the speed of one of them with. respect to the other two.

12. A receptacle for material to be worked over, eccentric'mulling rollers, and means for driving said rollers so as to mull the material in said receptacle. '13. A receptacle for material to be worked over, a shaft provided with means for moving it, and a' series ofshort eccentric rollers secured to said shaft at positions angul arly displaced with respect to each other, said rollers being arranged to operate on material in said receptacle...

14. The combination with a receptacle, and devices for conveying material therethru,

of a shaft driven by the conveying devices,

and eccentrically placed rolls mounted upon 3.16. A channel having intake and dis-' charge openings, aconveyor shaft provided with flights for moving material from one opening to the other, mixing devices car.-

ried by the shaft between. the flights and serving to turn the material over and over as it is being conveye mulling rollers also carried by theshaft'b tween the flights .and serving to work the aterialas it is being mixed and conveyed, and spring-actuated leveling devices also carried by the shaft and located behind the mixing and before the mulling rollers. 17 A continuous mixer having intake and discharge openings, aconveyor arranged to 'move material from one opening to the other, mixing and mulling devices carried by the conveyor and arranged to operate on material as it is being conveyed, and leveling said shaft and arranged to engage material mixing and mulling devices.

18. In a continuous m1xer,'-a channelhav ing intake and discharge openings, a shaft provided with means for conveying Inaterialfrom one opening to the other, devices for mixing and mulling material asit is being conveyed, and leveling devices located between the mixing and mulling devices and serving to prepare mixed material for ac- 29 tion by the mulling devices.

19. A hannel, a sh ft extending lo'ngi-. tudinallythru said channel, means by which material may be fed into one end of said channel, aconveying device arranged to move theincoming material into the body of'the channel, a transverse plate located in the" channel adjacent to the conveying de 1 is w sa1dconveyor;

i is, moved to the'conveyor vice and "serving to limit the thickness of the: material moved into the body of the channel by the conveying device, and devices for operating upon the material after it has been moved past said plate.

20. A channel'provided with intake and discharge openings, atransverse plate, dividing off a small chamber in the channel adjacent to the intake opening and leaving a limited opening beneath, a device locate in said chamber and serving to push incoming material thru said opening, a shaft exv tending thru said plate and operating said device, a conveyor operated by said shaft and serving to move material along in the channel to the discharge opening, and :devices carried by the shaft and operating upon material as it is being 'conveyed.-

21. A channel providedwith intake and discharge openings, partitions-dividing ofi small portions of the channel at each end, the partition at the intake end bein erranged to leave an open space thereun er, a power driven shaft supported'in said, chan nel and extending thru said partitions, a device located in the chamber at the intake hd of the channel and serving to move material thru said open space and into the body of the channel, conveyor flights carried by the shaft and servin to move material thru 7 said channel to the 'schargeopening, other devices arranged to operate on the material while bein so conveyed, and connections 10- cated in t e chamber at the dischar e end and servin to operate said other evices fromsaid aft. T

22. A channel having intake and discharge openings at its opposite ends, a partition forming a' chamber at theadispharge 40 end, a power driven conveyor serving to move material thrii said channel from the intake to the discharge, devices arranged to operate on the material as it is being-conveyed, and connections located in said'chamher and serving to drive said devices from 23. A channel having intake ands dis= charge openin at opposite ends partitions [forming cham rs at the ends o the chan nel, the partition at the intake end roviding a pasa'gewayof a predetermine size, a wer driven conveyor for moving materlal om the intake to the discharge openings, a device located in. the intake chamber and serving to move material thru said passageway to the conveyor, other devices arranged 'to operatelp on matergial as it is being con; veyed, and ivmg connections between-said conveyor and; said other devices and lbcated within the chamber at the discharge end.

24. A channel having intake and discharge'o enings at opposite ends, a conveyorarrange toqmov'e material from one-open-- to the other, means by which'material at the in a maintainthe material in' a layer approxi mating that at which it enters the conveyor.

'posit e ends of said shaft, other sha and parallel with said convcgor; and mulling devices.

- the conveying an the mixing devices.

termining the thickness of the body of malayer of predetermined thickness, devices for working the material as it is being conveyed, and leveling plates arranged to smooth the surface of the worked material so flSftO 25. In a machine of the class described, a channel having intake and discharge openings, a main shaft extending lon 'tudinally thru said channel, arms mounte u on opr Su ported on the ends of said arms and pa r allel with the main shaft, ,mulling devices carried upon said shafts, and an adjustable conveyor carried by the main shaft and serving to move'inaterial from intake to discharge openings as it is being mulled by said mullin devices. I 26. n a machine of the classdescribed, a channel provided with intake and discharge openings, an adjustable conve or arranged to move material continuo y from one 'opening to the other, arms mounted upon said conveyor, shafts carried by said arms devices carriedby said sha ts and arranged to operate on material as it is being conveyed.

27. In'a machine of the class described, a channel provided with, intake and discharge openings, a conveyor for moving material from one opening to the other, arms carried by the conveyor, shafts supported in the ends of the arms, mulling-devices carried by said shafts, and means for adjusting the" eed relationship between conveying and mu ling p 28. In a machine ofthe class des ribed,v a conveyor for moving material, a channel in which said conveyor operataarmscarried by the conveyor, mixing plates supported in bearin s in saidlarms, driving connections .-rotat ng said plates in their bearings as the conveyor operates, and means for varying the s eed rel'atioiiship'between 29. In a device of the class described, a I

conveyor arranged to move material from receiving to discharge'points,arms carried;

by the conveyor, mixing plates supported in bearings at the ends of the arms, means for V causing the mixing plates to turn in their bearings as they are carried around by the conveyor, and means for varying the speed relationship between the conveyor and the mixi plates. f

- 30.. n a device of the class described, a conveyor arranged to move material from intake to discharge openings, means for deterial entering at the intake opening,,d e'- vicescarried by the conveyor and actin on the material to disturb the evenness o the surface'of the material moved by the conveyor, and leveling plates also carried by v i actuated smoothing the conveyor and acting 'on'the material to restore the evenness of the surface thereof 31. In a machine of the class described, a channel provided with intake and discharge openin s, conveying devices for moving material rom oneopening to the other, spring lates carried by the conveying devices and acting upon the surface of the material being conveyed, and adjustable stops for limiting the action of the smoothing plates.

'32. In a machine of the class described, a channel provided withintake and discharge openings, conveying-devices for moving material from one opening to the other, mixing devices carried by the conveying devices and arranged to turn the material over and over as it is being conveyed, and spring actuated smoothing devices carried by the conveying devices and arranged to act upon the surface of the material disturbedby the mixing devices.

33. In a. machine of the class described, a channel provided with intake and discharge openin s, conveying devices for moving material rom one opening to the other, mulling-rolls carried by the conveying devices openings, conveying devices for moving material from one opening to the other, mulling rolls carried bythe conveying devices around the. axis of the channel and acting upon the material bein conveyed, smoothing plates similarly carried by the conveying devices and serving to' prepare" the surface of the material for the rolls, andmixing devices 7' also carried by the conveying devicesand arranged'to turn the material over after it has been acted u on by said rolls.

35. In a machine of the class described, a channel provided with intake and discharge openings, conveying devices for moving ma terial from one opening to the other, mulling rolls supported in bearings and carried by the conveying devices around the axis of the channel, mixing devices similarly supported and carried, means by which the. mulling rolls and mixing devices are, caused to turn in their bearings as they'move about the 'axis of the channel, and means for varying the speed of conveying as compared to the speed of the mulling rolls and mixing-de- V1068.

v 36.111 a machine of the-class described, a channel provided with, intake and'discharge ope lngsfconveying devices for moving material om one opening to theother,

gears located in said channel a spiders carried'by the conveying devices and having hearings in the arms thereof, shafts supported in said bearin s and parallel with the axis of the channel, mulling rolls on some of said shafts and mixing devices on others of said shafts, means for turning said shafts in their hearings to operate the rolls and the mixing devices, and means for wit - speed of the mulling and mixing devices.

37. In a machine of the class described, a channel provided with intake and dis-.

varying the speed of said conveying devices I out at the same time changing the charge openings, conveying devices for moving material from one opening to the other,

means operated by the conveying devices for causing, the material to enter the channel in a layer of predetermined thickness,

and mixing and mulling devices arranged,

to operate on the material as it is being conveyed.

38. In a machine of the class described,

at channel provided with intake and discharge openlngs, conveying devices fonmoving material from one opening to the other,

devices carried in bearings supported by the conveying devices and moved about the axis of the channel by the operation of the conveying devices, gears located at the dis charge end of the channel and serving to turn said devices in their bearings, and a protecting plate forming a chamber for said by 1 the conveying said gears.

ing material from one o ening to theother, mixing and mulling devices carried in bearings supported by the conveyin devices,

Aacent' to the discharge-opening thereof an serving to turn saidmixin and mulling devices in their bearings, an a protecting plate supported within the channel adjacent to said gears and serving to shield them, from contact by thennaterial moved bythe conveyin'g devices to the discharge opening of t e channel.

40.In a machine of the class described, a channel provided with intake and dis- "39. In a machine of the class described,- a channel gears and serving to revent material moved j evices from engagmg provided with intake and dis- .charge openings, conveying devlces for movcharge openin 's, conveying devices for moving material om one opening to the other,

arms carried by the conveyor, shafts su ported in the ends of the arms, mulling e jvices consisting of eccentric rolls secured to said shafts, and gears operated by the conveyin devices for'turning. said shafts in their earings so as to give a positive drive to said rol s.

41.111 9. machine of-the class described, a channel provided with intake and discharge opcmngs, conveying devices for movthe axis of the'channel, and gears serving to give said rolls a positive drive so as to cause them to-work to continually varying depths into the material as it is being conveyed.

42. In a machine of the class described, a channel rovided with intake and discharge openings, conveying devices for moving material from one opening to the other, a shaft supported in bearings carried by the conveying devices and moved thereby in an orbit about the axis of the channel,

a roll secured in an eccentric position on conveying devices for moving a layer of said shaft, and positive drive connections for turning said shaft in its bearings so as to cause said roll-to work to varying depths in the material as it is being conveyed by the conveying devices.

43. In a machine of the class described,

* means .for moving material in a substantially uniform stream from one point to another, mulling rolls movable transversely across thestream .of material as it moves,

and ineans for causing said rolls to operate to predetermined and varying depths in said material. 1

44. In a machine of the class, described, conveying devices for moving a layer of'material' from one point to another, meansfor determining the thickness of such layer, mulling rolls operating upon the moving material by a movement which is transverse to the movement of the material, means for causing said rolls to operate to varying depths in the moving material, and driving connections vbetween the conveying devices and the m'ullingrolls. J

45. In a machine of the cless described,

material from one point to another, means for determining the thickness of such layer, mulling rolls operating upon the material by a movement which is transverse 40 the movement of the material, driving connections so that one is" driven from the other,

,and means for adjusting the conveying speed independently of the speed of the mulling rolls. 5

JOSEPHT. SIMPSON. 

